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[sanstats] Print the correct line information. 

The instrumentation tracks the return address and not that of the
call so we remove one to compensate. Thanks for Peter Collingbourne
for confirming the analysis of the problem.

llvm-svn: 307871
This commit is contained in:
Davide Italiano 2017-07-13 00:49:03 +00:00
parent a6c57dd989
commit 4d6ef11e48
3 changed files with 8 additions and 1 deletions
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BIN
llvm/test/tools/sanstats/Inputs/debuginfo.stats Normal file
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4
llvm/test/tools/sanstats/debuginfo.test Normal file
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@ -0,0 +1,4 @@
# RUN: sanstats %p/Inputs/debuginfo.stats | FileCheck %s
# CHECK: stats.cpp:23 vcall.cfi cfi-vcall 37
# CHECK: stats.cpp:28 nvcall.cfi cfi-nvcall 51

5
llvm/tools/sanstats/sanstats.cpp
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@ -76,8 +76,11 @@ const char *ReadModule(char SizeofPtr, const char *Begin, const char *End) {
if (Begin == End)
return nullptr;
// As the instrumentation tracks the return address and not
// the address of the call to `__sanitizer_stats_report` we
// remove one from the address to get the correct DI.
if (Expected<DILineInfo> LineInfo =
Symbolizer.symbolizeCode(Filename, Addr)) {
Symbolizer.symbolizeCode(Filename, Addr - 1)) {
llvm::outs() << LineInfo->FileName << ':' << LineInfo->Line << ' '
<< LineInfo->FunctionName << ' ';
} else {